Roller-mill



(No Model.)

N. W. HOLT. ROLLER MILL.

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FFTCF@ PATENT NOAH W HOLT, OF BUFFALO, NEW YORK ROLLER-MILL.,

SPECIFICATION forming part of Letters Patent No. 252,945, dated January 31, 1882. `rApplication filed Novcmberl, 1881. (No model.)

To all Iwhom it may concern Be it known that I, NOAH W. HOLT, of the city of Buffalo,in the countyof Erie and State of New York, have invented new and useful Improvements in Roller -Mil-ls, of which the following is a specification.

This invention relates to that class of rollermills which are employed for the reduction of grain and similar substances, and has reference more particularly to the means for driving the' rollers of a mill containing two pairs of rollers.

It has for its object to avoid the slipping of the driving-belts and to prevent the slow rollers from gathering speed by director indirectV contact with the fast rollers.

My invention consists of the peculiar driv ing mechanism which will be hereinafter fully described.

.a Like letters of reference refer to l1ke parts in the several figures.

A A represent the stationary side frames of the roller-mill.

B B representthe fast rollers, and B'B the slow rollers, all mounted in suitable bearings, which are secured to the side frames, A.

O O represent two pulleys of equal size, mounted on the shai'ts ot` the fast rollers B B; and 03 represents the endless driving-belt, which runs over a driving -pulley below (not. shown in thedrawings) and over the pulley O in the direction of the arrow iu Fig. l, thence downward and around a pulley, P, secured to a counter-shaft, thence upward and around the pulley' O', and thence downward and around the driving-pulley below. The countershaftp is supported adjacent to the pulley B in an adjustable bearing, p', which is attached by a vertical adjustingscrew,p2, to a standard,p3.

Q Q' represent two pulleys mounted on the shafts ot'the slowlrollers B' B'on the opposite side of the machine; and q represents the endless drivingheft, which rims around the pulley Q, thence downward and around a fiictionpulley, Q3, theilceiip\vaid and around the pulley Q', thence downward and around the driving-pulley Q3, and thence upward to the pulley Q. The driving -pulley Q3 is secured to the counter-shaft p near its end, which latter is supported in a bearing, i", made adjustable on a vertical screw-bolt, r'. The friction-pulley Q3 is secured to a short shaft, s, which turns in a bearing, S. The latter is attached by screw-bolts s' to a carrier, T, which slides on the upper portion of the vertical bolt r', and which is also provided with a rib, t, which slides in a vertical groove in a standard, T. The latter is secured with its base to the tloor and provided at its upper end with a'lug, t', through which the threaded upper end ofthe bolt 1" projects. t2 represents a spiral spring, which bears upon the carrier T, and whose tension is adjusted by a screw-nut, t3, applied to the upper threaded portion of the bolt i". By this means `the friction-pulley Q3 and the belt q surrounding it are tirmly pressed against the driving-pulley Q3, whereby the belt Q is coinpelled to follow the 'movement of the drivingpulley Q3 without slipping and the slow rollers are prevented from gaining speed by contact with the fast rollers.

I claim as my invention- 1. In a rollermill, the combination, with pulleys Q Q', adriving-pulley, Q3, and an end less driving belt, q, ot' a friction pulley, Q3, which is partially surrounded by the drivingbelt q, whereby the latter is pressed against the driving-pulley Q3, substantially as set forth.

2. The com biuation, with two fast rollers provided with pnlleys O O and two slow rollers provided with pulleys Q Q', ot' the main driving-belt O3, pulleys P and Q3, mounted on a counter-shaft, p, secondary driving-belt q, triction-pulley 3, and mechanism whereby the pulley Q2 and the belt-q surrounding it are pressed against the pulley Q3, substantially as set forth.

3. The combination, with the pulleys Q Q', driving-pulley Q3, and endless driving-belt q, of the friction-pulley Q3, movable hearing T S,

suitable support therefor. and spring t2, whereby the friction-pulley Qzis pressed againstthe driving-pulley Q3, substantially as set forth.

4. The combination, with the pulleys Q Q',

driving-pulley Q3, and endless driving-bell; g, Y of the frietiou-pulleyQ, which is partially surrounded by the beltq, and whereby the latter is pressed against the pulley Q3, adjustable hearing r, adjustable carrier T, provided with hearing S, spring t2, screw-bolt r', suitable suplo port; therefor, and adjusting-uut t, substan- 

